/Engine/Source/Editor/MaterialEditor/Public/MaterialEditingLibrary.h
Update a Material Function after edits have been made. Will recompile any Materials that use the supplied Material Function.
static void UpdateMaterialFunction ( [UMaterialFunctionInterface](API\Runtime\Engine\Materials\UMaterialFunctionInterface) * MaterialFunction, [UMaterial](API\Runtime\Engine\Materials\UMaterial) * PreviewMaterial )